Ask the average Belgian cavediver if he knows the flooded mine of Denée managed by the UBS and he will answer you affir- matively. Most will know that it is a black marble mine. And yes there is an old plan circulating on the internet to prepare for the dive. But more? And if you show a non-caver a photo of underwater in the mine, he looks up startled and says you must be crazy. Divers from Global Underwater Explorers Belgium (GUE-BE) and the Groupe Spéléo de Charleroi (GSC) are jointly setting up a project to better document the mine and make this piece of Walloon industrial history accessible to the general public.

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